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https://issues.apache.org/jira/browse/KAFKA-7971?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16780418#comment-16780418
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Maciej Lizewski commented on KAFKA-7971:
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Yes it does sound right. It is pretty much what it already did to achieve my
goal.
What I am trying to say here is that this Transformer still has to be attahed
to some input stream and mus have transform() method returning "null" - just
dropping any incoming message. That is not very good style of coding for me...
The black box component here should have only output stream and no input
connector.
> Producer in Streams environment
> -------------------------------
>
> Key: KAFKA-7971
> URL: https://issues.apache.org/jira/browse/KAFKA-7971
> Project: Kafka
> Issue Type: Improvement
> Components: streams
> Reporter: Maciej Lizewski
> Priority: Minor
> Labels: newbie
>
> Would be nice to have Producers that can emit messages to topic just like any
> producer but also have access to local stores from streams environment in
> Spring.
> consider case: I have event sourced ordering process like this:
> [EVENTS QUEUE] -> [MERGING PROCESS] -> [ORDERS CHANGELOG/KTABLE]
> Merging process uses local storage "opened orders" to easily apply new
> changes.
> Now I want to implement process of closing abandoned orders (orders that were
> started, but for too long there was no change and they hang in beginning
> status). Easiest way is to periodically scan "opened orders" store and
> produce "abandon event" for every order that meets criteria. The obnly way
> now i to create Transformer with punctuator and connect output to [EVENTS
> QUEUE]. That is obvious. but Transformer must be also connected to some input
> stream, but these events must be dropped as we want only the punctuator
> results. This causes unnecessary overhead in processing input messages
> (although they are just dropped) and it is not very elegant.
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